Artificial tooth.



F. H. RUSSELL.

' ARTAJFICIAL TOOTH. APPLICATION FILED JUNE 9. 917.

Parbnted May 7,1918.

E21- I Emaanwutox (litany,

FRANK H. RUSSELL, OF ELKO, NEVADA.

ARTIFICIAL TOOTH.

Specification of Letters Z Patent. Patented May 7, 1918.

Application filed June 9, 1917. Serial mnasvs.

To all whom it may concern:

Be it known that FRANK H, RUssELL, a citizen of the United States, residing at Elko, in the county of Elko and State of Nevada, has invented certain new and useful Improvements in Artificial Teeth, of which the following is a specification.

This invention relates to certain new and useful improvements in an artificial tooth to be used in crown and bridge work in dentistry.

The principal object of the invention is to provide a novel mounting of metal for a crown of porcelain or other composition, and it consists in the features of construction hereinafter described and claimed, reference being had to the accompanying drawing wherein Figure 1 is a bottom perspective of a molar or bicuspid crown constructed in accordance with the present invention;

Fig. 2 is a perspective of the pan or cupshaped base cap for the crown;

Fig. 3 is a bottom plan of a crown slightly modified;

Fig. 4 illustrates in bottom plan a further modification of a crown constructed in accordance with this invention;

Fig. 5 is a plan view of the pan or base ca c Fig. 6 shows in perspective a tooth having a full base cap; and

Fig. 7 is a view showing an application of the invention.

Referring more in detail to the drawing, the numeral 1 designates the crown tooth formed of porcelain or other material and having an overhanging projection 2. The

crown is formed with a base 3 in the rear of the overhanging projection 9., said base being heel-shaped having a fiat bottom and side walls, extending substantially at right angles to the bottom. A shoulder or seat 4 extends around the'base at the junction of the side walls of the latter with the body portion of the crown. The inner or transverse wall of the base is straight and the overhanging projection is also formed with a straight wall opposing the straight wall of the base and spaced therefrom to form a groove 5.

The pan or base cap is preferably made of gold, or other metal, and consists of a bottom 6 and an edge flange 7 conforming to the shape of the crown base. The inner transverse flange 7' is substantially vertical and seats in the groove 5, whereas the opposing curved end wall 7 is slightly flared, as depicted in Fig. 5.

In practice, the base of the crown is set in the pan and secured thereto by a cementitious composition, rivets, screws or other suitable means of securement (not shown) as denting or bending in the edges of the pan. The base of the crown may extend at any angle although that shown is preferred.

The crown projection may extend at an angle from the groove 5, having an inclined tapering face 8, or the inner face may be extended in the plane of the adjacent wall of groove 5, as depicted in Figs. 3 and 4.

The crown is made either with a projecting part, as in Fig. 1, or without such part as in Fig. 6, in which latter form the base cap or pan is designed to entirely cover the bottom of the crown.

The slot or groove 5 may be of any dimensions and may extend entirely across the surface inside the crown or in back of the projection 2, and may be regular with smooth sides as in Fig. 1, or it may heirregular and rough as at 9 in Fig. 3. In the particular form depicted in the latter view, the pan or base cap will have a rigid interlock with the irregular and roughened wall 9 to more securely hold the pan and crown in their operative relation. The groove ma extend only part way from either or bot sides, as at 10 in Fig.4 in which case the transverse flange of the base may be separated at its center formed with a notch to receive the partition 11.

One use or application of my invention is illustrated in Fig. 7 in which A and B designate the cap crowns for the natural teeth C and D, said crowns having the edge flange or wall 7 of the interposed pan 6 soldered thereto to provide a means of support at opposite sides of the pan. The latter is supported by the crowns at an inclination so that the crown tooth will properly be disposed when set therein.

My improved construction permits me to set a crown or tooth of porcelain, or any other composition or material, into a pan of cup-shaped metal and be securely held therein by a cementitious hinder or other fasten ing means.

What is claimed is:

1. An artificial tooth comprising a crown having a base and an overhanging projection separated from thebase by a groove,

and a pan into which the base is set having an upstanding flange engaging in the groove.

2. An artificial tooth comprising a crown having a base and an overhanging projection separated from the base by a groove one Wall ofwhich is roughened, and a pan for receiving the base having a flange engaging in the groove.

3. An artificial tooth comprising a crown having a base and an overhanging projection separated from the base by a divided groove, and a pan into which the base is set having an upstanding flange engaging in the groove.

In testimony whereof I affix my signature.

FRANK H. RUSSELL.

Copies of this patent may be obtained for five cents each. by addressing the Gommissionei'of Patenta Washington; D. Q. i 

